Grinding on let off?

[Satchmo]

Hey all,

Quick question for those running 22re.

My 1991 makes a weird grinding sound kind of a low rumble when i let off the accelerator, particularly noticeable at high speed 70-80 mph.

Any thoughts on cause?

 

[KidVermicious]

Where's it coming from? Do you feel it or hear it?

There could be other causes, but my brain went immediately to ujoints on the driveshaft.

 

[4runnin83]

Does it sound like a metal on metal 'SHKKKKKK SHKKKKKKKK' sort of thing?

Mine did that do, anytime I let off the accelerator around 40 or less mph. And KID is right, it was the u joints

 

[Satchmo]

That's exactly what it sounds like. Thanks guys I'll check it out.

 

[nevada]

rear pinion nut is loose.
very common.

 

[runnercam]

rear pinion nut is loose.
very common.

:iagree:

seen this happen many times. what happens when you let off is the flow of power is reversed causing the pinioin gear to fall into the diff and start grinding againt the carrier. torque spec on that nut is 135 ft/lbs i believe